Randall, co-auther (along with Peter Schwartz) of Abrupt Climate Change [PDF] is interviewed by World Changing Blog:

Their scenaric findings — that the gradual global warming we’re experiencing could plausibly trigger an abrupt climate snap, and that its effects would be massive, perhaps catastrophic, and of direct relevance to the national security of the United States — we’re picked up by media around the world, gathering a snowball of controversy and hype along the way. Their scenarios, freely available on the Web, were termed a “secret Pentagon report,” and their descriptions of possible climate catastrophe taken as bald prediction.
But underneath the hype was a reasoned attempt to judge the seriousness of the threat posed by climate instability. That’s something all of us hoping to change the world have to take into account. So we asked Doug about the implications of that report (now that the dust has settled), the movie The Day After Tomorrow, and how to think about the future of climate change.